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• sandstone unit at rates proportional to their permeability The <br />dipping aquacludes-and aquitards in the recharge area <br />prevents the lateral development--of-a water table with a uniform <br />gradient. Water level measurements-made in cased holes and exploration <br />drilling records generally show a water table to be encountered <br />anywhere from 75 to 500 feet, depending upon the particular <br />strata penetrated. <br />Just north of the Joint Venture lease area lie the Corley, <br />Canyon Chief, Black Diamond, and Double Dick mines. These <br />mines, which extracted coal underground from seams overlying the Pine <br />Gulch are all interconnected and are now abandoned. At the time of <br />abandonment, the total pumpage from this complex was approximately <br />• 350,000 gallons per--day-ors sustained flow of 243 gpm. --Realizing <br />the considerable extent of the underground workings contributing <br />to this flow, this is equivalent to less than 1 gpm of production <br />per undergrcriad acre mined. Since abandonment, the water level <br />in the mines has slowly risen. Currently, the water level in tl-.e mines <br />stands at an elevation of approximately 6100 feet. <br />In general, the rate of groundwater movement in the lease <br />area is restricted by the low permeability of the Vei~ejo Formation and <br />the direction of migration is rigidly controlled by the Chandler <br />S~-ncline. <br />• <br />3-9 <br />